2012 Geological Society of America Annual Meeting & Exposition


Mr. Daniel Linder of RJ Lee Group’s Geological Services Department will make two presentations, and Mr. Matt Sanchez, Manager of Analytical Services, will also make a presentation, at the 2012 Geological Society of America (GSA) Annual Meeting & Exposition in Charlotte, North Carolina.  On Sunday, November 4, 2012, at 2:35 p.m., Mr. Linder will present a session entitled, “The Often Overlooked Use of Polarized Light Microscopy in the Mining Industry.”  Also on Sunday at 3:50 p.m., Mr. Sanchez will present, “Quantifying Percent Amphibole Asbestos by Powder X-Ray Diffraction and Polarizing Light Microscopy:  Using Soils from Libby, Montana and El Dorado Hills, California USA.”  On Tuesday, November 6, 2012, at 8:30 a.m., Mr. Linder will present, “3D Digital Block Modeling and 4D Mine Plans.”

The GSA Annual Meeting & Exposition is attended by approximately 6,000 individuals from various geoscience disciplines.  It features sessions, events, and learning opportunities about recent developments and research related to the geosciences.

Presentations and Sessions:

November 4, 2012

2:35 p.m. – “The Often Overlooked Use of Polarized Light Microscopy in the Mining Industry” Mr. Daniel Linder

Though often overlooked, the use of the Polarized Light Microscope can be a powerful tool in the mining industry.  The PLM can be used, for example, in certain types of mineral identification at a tremendous cost savings.  Case studies and examples of PLM use will be presented throughout the seminar.

3:50 p.m. – “Quantifying Percent Amphibole Asbestos by Powder X-Ray Diffraction and Polarizing Light Microscopy:  Using Soils from Libby, Montana and El Dorado Hills, California USA”

Six soil samples were taken, three each from Libby, Montana and El Dorado Hills, California, and they were analyzed for percent asbestiform and percent non-asbestiform amphiboles.  The analysis indicates a major discrepancy between the California Air Resources Board’s (CARB) proposed definition of asbestos and the actual asbestiform amphibole content of these soils.

November 6, 2012

8:30 a.m. – “3D Digital Block Modeling and 4D Mine Plans” Mr. Daniel Linder

An effective mine plan relies on a robust digital 3D geological model to design the plan.  Data including aerial photography, topography, field mapping, drilling, and rock properties form the basis of the model.  Accurate and efficient 4D mine plans incorporate this geologic model as well as all applicable mining parameters.  The entire process of geologic modeling and mine planning provides opportunities to generate high quality technical illustrations that are necessary for day-to-day mining operations and management decision making and planning.

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